Merge lane/testphase in feature/craftvia-mvp

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

# Conflicts:
#	prisma/schema.prisma
#	scripts/test-e2e-tenant-isolation.ts
#	src/server/backup/topology.ts
#	src/server/db.ts
#	src/server/dsgvo/pii-fields.ts

src/server/db.ts

@@ -130,6 +130,8 @@ const TENANT_MODELS = new Set<string>([
   "LotseConversation",
   "LotseMessage",
   "LotseActionProposal",
+  // L15 Testphase: Datenexport des Mandanten
+  "TenantExport",
   // WebAuthnCredential/Identity sind identitäts-global (kein tenant_id) → NICHT hier.
   // Craftvia-Fachmodelle hier ergänzen — UND in src/server/backup/topology.ts
   // (TENANT_MODELS) sowie per `SELECT enable_tenant_rls('<table>')` in der Migration